Kit SMA Cables Spec Sheets
Are there any available spec sheets for the kit SMA cables? Hoping to find a table or chart of insertion losses in dB.
|
The processor of the tinySA is not fast enough to produce a usable pseudo noise.
And there is insufficient space to add a HW noise generator without impacting the SA performance.
--
Designer of the tinySA
For more info go to
|
TinySA Ultra 50 Khz as a signal generator
Hello,
?
Last year I purchased a TinySA Ultra in order to make some alignments in my old HF receivers, a pair of Drake SPR-4.
?
To say the truth I purchased the Tiny because it goes down to 50 Khz and finding a signal generator that covers from 10/ 50Khz is quite difficult and expensive.
?
I have problemms in making the alignment and I do not know if is the generator or some other part. Starting the alignment with the IF 50Khz BFO? is quite easy, first coil can zero beat the note but the following coils there is no movement? either in voltmeter or S-meter.
?
I have tried with passive and active probes because I suppose that is a high impedance circuit. Maybe am I doing something wrong with the generator? Is the input typed wright, as the attached photo shows?
?
This is the manual: page 23
?
?
?
?
?
?
?
|
On Thu, May 22, 2025 at 07:33 AM, ats52@... wrote:
But the generator will be the same in all TinySAs and it will be possible to
exchange the results , for example, of NPR measurements.
No, even a a zener, high pass filter and one MMIC like an MAR6 on track side of stripboard is better. Due to power constraints a noise generator per part of spectrum is best. Filter between the zener and the the MMIC.
Software based noise sources are poor.
|
Re: USB connection to TinySA fails using QtTinySA on Pi
QtTinySA should work with all genuine hardware versions and the arm64 binary works (and was compiled on) on my Pi4.? I only have the Ultra so I can't test other versions.
There has been the occasional firmware version that didn't work.? I have not tested firmware v1_4_175 but I have tested 177, 189, 193 and 199 which all work, as do a lot of the earlier versions.
??
From 177 onwards, Erik updated the firmware for me to allow the 'scanraw' command to loop and scan continuously.? This made a noticeable improvement to the QtTinySA scanning speed, so unless you have some particular reason for not updating to a later version there is an advantage in being on 177 or later.
??
I am happy to help more but this is Erik's forum so please raise the issue on
??
Please post the output of the terminal screen.? In terms of 'remote access', I use my Pi4 running QtTinySA over 'tigerVNC' and it works very well on my gigabit LAN.
??
Ian
|
It is clear that the noise will not be completely white. But the generator will be the same in all TinySAs and it will be possible to exchange the results , for example, of NPR measurements.
|
PC Control of Sweep Accuracy Features
I am using Tinysa over USB to Ethernet solutions, and QTTinySA
?
I was wondering if TinySA could allow the Sweep Accuracy Features to be changed via PC control, currently I am loading a profile before the device is used in a remote mode, but would love to be able to change these remotely.
?
- Normal/Precise/Fast/Noise (Selection Box)
- NSpeedup
- WSpeedup
?
?
?
?
|
What's more, the attenuator(s) stabilize the output impedance.
Dave - W?LEV
On Wed, May 21, 2025 at 6:14?PM ajparent1/kb1gmx via <kb1gmx= [email protected]> wrote: I have a similar noise source and the easy way to lower its output
is an attenuator 20-30db should be adequate.? Saves digging into
the circuit.
?
--
Allison
-----------------------------------------
Please post here, direct emails go to a dead letter box.
|
>>>Is it possible to add a noise Generator function to TinySA?
?
Yes, but the noise quality as you increase frequency
will be poor. In software (on MPU) the way to get
noise is implement pseudo random? sequence for
rate and amplitude but?you do not get white noise
as its bandwidth limited.
?
An external diode noise source is generally better
and easily characterized.
?
--
Allison
-----------------------------------------
Please post here, direct emails go to a dead letter box.
|
I have a similar noise source and the easy way to lower its output
is an attenuator 20-30db should be adequate.? Saves digging into
the circuit.
?
--
Allison
-----------------------------------------
Please post here, direct emails go to a dead letter box.
|
USB connection to TinySA fails using QtTinySA on Pi
I'm trying to use a Pi 4B to view/control TinySA.
I've sucessfully installed QtTinySA on a clean image and it works just fine with a TinySA Ultra+
I've had a TinySA in my bag as a "don't leave home without it" device for a few years and tried connecting it instead of the Ultra.
I can see it if I run lsusb so there is a connection, but it is not recognised by QtTinySA
It does connect to a Win PC and i have updated it to 1.4.175
I've reread the QtTinySA Wiki and I can't see any reference that it only supports Ultra.
Am I missing something obvious?
?
I'm keen to see if I can develop into a remote access Spectrum Monitoring device. We have a fleet of them based on other hardware.?
Any help appreciated.
Cheers
Peter
|
Good afternoon. I am aware of this generator. I have three of them, all slightly upgraded as the noise is very dirty. the latter has everything done to produce pure white noise at least on HF . I also have https://github.com/k3it/osa103-mini ?ysclid=maxxsxro82487715627 it has the NG function, but it is not standalone. I would like to have NG in TinySA.
73! R1BLT Alexander?
|
Be careful with those noise sources from e.g. BG7TBL.? Mine puts out +8dBm of wideband noise, which is enough to compress or even possibly damage a sensitive input like on the TinySA.
If you compress the receiver when calibrating you will get inflated numbers when measuring items like filters
.??
My BG7TBL generator has 3 MMICs in series after the noise diode; I plan to take the output from earlier in the chain to see if I can get a more-reasonable output level.? Mine has an excess noise ratio (ENR) of over 100dB, commercial units typically are 5 or 15dB ENR.? Of course I could just add attenuation but removing MMICs will also lower the fairly high power consumption, which makes the board hot and changes the output level..
73, Don N2VGU
|
Build your own.? A Zener right at the breakdown is extremely noisy.? Follow that with a couple of MMICs and a pad or two for impedance stabilization, and you're there.
Dave - W?LEV
Is it possible to add a noise Generator function to TinySA?
|
Is it possible to add a noise Generator function to TinySA?
|
Re: Best settings for impulsive wide-band 6m RFI hunting
And... use the widest bandwidth that allows sufficient S/N.
Dave - W?LEV
On Tue, May 20, 2025 at 9:15?AM Andrea I2UEA via <tempoliberoesport= [email protected]> wrote: Hi. What are the best setting to quickly hunt an impulsive wide-band noise in 6m band? My current settings in my TinySA Ultra:
?
-FREQUENCY: 49 - 55 MHz (a little more of the detected noise)
-SWEEP POINTS: 290 point
-SWEEP ACCURACY: FAST
-WSPEEDUP: 2
-CONFIG - SPUR REMOVAL: OFF
?
I have the following problems:
?
1) I'd need a faster scan in order to locate the noise source with my portable loop.
?
2) when I use the command? STORAGE - SAVE CAPTURE, I hardly can capture well the yellow impulsive noise, as it changes very quickly . This was a very lucky shot.
?
Any suggestions will be appreciated.
?
Many thanks
 ?
|
Re: #tinysa #ultra Leveling TinySA Ultra with damaged LNA
#tinysa
#ultra
As i could not source ZK10D, i have bodged BGA2817 in my ZS-407. It now passes self-test and calibration to 7.3Ghz. I dont have enough experience using SA to confirm it works perfectly, but i'm sure it's better then shot LNA.
Steps to reproduce:
1. Remove R62, L18 and U2 with hot air gun. (I stuck them with piece of kapton tape to the battery, in case i'll get my hands on ZK10D later)
2. Bend pin 1 of BGA2817 up, bend pin's 3 and 6 closer to IC's body.?
3. Put it on board and rotate it 45 degree clockwise. pint 3 and 6 should align with out/in pads. Pin 5 and 2 will align with ground. Solder it.
4. Solder lifted pin 1 to power supply pads exposed by removing R62 & L18, with a bit of wire. Put a solder blob between pins 4 & 5.
?
|
Re: Best settings for impulsive wide-band 6m RFI hunting
Trace -> Calc Off -> Max Hold
This is how you capture quick pulses. Max Hold captures the highest peak and continues to display it until a new higher peak is detected. You can refresh it by turning it off and then back on again.?
Max Decay does the same thing but it gradually decays over time until a new higher peak is detected.?
Display -> Sweep Time -> 1000 ms
You can also try a longer sweep time.?
On Tue, May 20, 2025, 3:15 AM Andrea I2UEA via <tempoliberoesport= [email protected]> wrote: Hi. What are the best setting to quickly hunt an impulsive wide-band noise in 6m band? My current settings in my TinySA Ultra:
?
-FREQUENCY: 49 - 55 MHz (a little more of the detected noise)
-SWEEP POINTS: 290 point
-SWEEP ACCURACY: FAST
-WSPEEDUP: 2
-CONFIG - SPUR REMOVAL: OFF
?
I have the following problems:
?
1) I'd need a faster scan in order to locate the noise source with my portable loop.
?
2) when I use the command? STORAGE - SAVE CAPTURE, I hardly can capture well the yellow impulsive noise, as it changes very quickly . This was a very lucky shot.
?
Any suggestions will be appreciated.
?
Many thanks
 ?
|
Best settings for impulsive wide-band 6m RFI hunting
Hi. What are the best setting to quickly hunt an impulsive wide-band noise in 6m band? My current settings in my TinySA Ultra:
?
-FREQUENCY: 49 - 55 MHz (a little more of the detected noise)
-SWEEP POINTS: 290 point
-SWEEP ACCURACY: FAST
-WSPEEDUP: 2
-CONFIG - SPUR REMOVAL: OFF
?
I have the following problems:
?
1) I'd need a faster scan in order to locate the noise source with my portable loop.
?
2) when I use the command? STORAGE - SAVE CAPTURE, I hardly can capture well the yellow impulsive noise, as it changes very quickly . This was a very lucky shot.
?
Any suggestions will be appreciated.
?
Many thanks
 ?
|
Re: No pulse on CAL when freq sweeping on signal generator
#tinysa
#ultra
On Tue, May 20, 2025 at 08:00 AM, Bob Ecclestone wrote:
Using a standard 10:1 CRO probe
Though that is still enough to detune some Valve circuit IFTs. Generally useful,
|
Mike EI9FEB
Donald S Brant Jr
Andrea I2UEA